A statement of fact, usually in the form of an e-mail, that renders all hostile (emailers) silent

Employee #1: I had been getting calls and e-mails all morning about the Widget Project. Managers want status, test group wants results.
Employee #2: What changed? Why did they stop?
Employee #1: I silenced them all when I explained to them the Widget Project was, in fact, not my project (according to my manager) and they need to direct their efforts towards <Employee X>
Employee #2: Sounds like you lobbed them a logic grenade